use singleton for helpers

COA.EnterpriseServices.DataAccess/Helpers/BaseHelper.cs

@@ -4,7 +4,7 @@ namespace COA.EnterpriseServices.DataAccess.Helpers
 {
     public class BaseHelper<T> where T : class, IRecord
     {
-        protected DataAccessManager<T> DataAccessManager { get; } = new DataAccessManager<T>();
+        protected DataAccessManager<T> DataAccessManager { get; } = Dependencies.Container.GetInstance<DataAccessManager<T>>();
 
         public virtual T Get(int id) => DataAccessManager.Invoke(d => d.Get(i => i.Id == id).FirstOrDefault());
 

COA.EnterpriseServices.DataAccess/Helpers/CreditorHelper.cs

@@ -17,6 +17,11 @@ namespace COA.EnterpriseServices.DataAccess.Helpers
             settlementAttemptDataAccess = Dependencies.Container.GetInstance<DataAccessManager<SettlementAttempt>>();
         }
 
+        public CreditorHelper()
+        {
+
+        }
+
         public Creditor GetCreditor(int id)
         {
             return creditorDataAccess.Invoke(d => d.Get(d => d.Id == id)?.FirstOrDefault());